Polysulfone nanofibers were prepared by electrospinning．The electrospinning equipment was designed in a new way

in which the spinneret was combined with a gas jet device．The intrinsic viscosity of the used polysulfone was 0.97 dL/g in dimethyl acetamide

which was also the solvent in electmspinning．The gas used in this gas jet/electrostatic spinning was nitrogen The relationship between the process parameters and the average diameter of polysulfone nanofibers was invesfigaled．The main process parameters studied in this work were the voltage

the flow rate of the spinning fluid

the distance between the spinneret and the nanofiber collector and the temperature in the spinning chamber．The other important factors determining the nanometer diameter were the spinning fluid properties including its viscosity

surface tension and electrical conductivity The average diameter and the diameter distribution of eleetmspinning nanofibers were measured experimentally by using scanning electron mlcmscopy．The diameter of polysulfone nmaofibers prepared by the gas jet/electrostatic spinning was in the range from 50 am to 500 nm．It was found that the diameter of nanofibers was mainly depended on the high voltage

the gap between the spinneret and the collector and the concentration of polymer solutions．As compared to the eouventional eletrospinning the gas jet/electrostatic spinning method could generate thinner and more uniform nanofibers with higher efllciency.